Hi Sudesh,

It's perfectly all right to change your stream in early years of education. Yes you can opt for economic in Delhi University. If you wish to do it from a regular college then you need to get atleast 95 percent and above in best of four subjects with English compulsory in your 12th board exam for admission in a good college.

wish you good luck. 

Hey, 

you can opt economics in Delhi University for undergraduate course even if you have studied medical in class 12th. But during admission your marks will be deducted by around 2.5%. This may change slightly. For example if your percentage is 95% in class 12, so 2.5% will cut from your score and 92.5% will be considered as final score for the admission process.